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dc.contributor.authorAnchieta, Rodolfo Bruniera [UNESP]
dc.contributor.authorMachado, Lucas Silveira [UNESP]
dc.contributor.authorBonfante, Estevam Augusto
dc.contributor.authorHirata, Ronaldo
dc.contributor.authorFreitas, Amilcar Chagas
dc.contributor.authorCoelho, Paulo G.
dc.identifier.citationInternational Journal of Oral & Maxillofacial Implants. Hanover Park: Quintessence Publishing Co Inc, v. 29, n. 3, p. 585-592, 2014.
dc.description.abstractPurpose: To evaluate and compare the reliability of implant-supported single crowns cemented onto abutments retained with coated (C) or noncoated (NC) screws and onto platform-switched abutments with coated screws. Materials and Methods: Fifty-four implants (DT Implant 4-mm Standard Platform, Intra-Lock International) were divided into three groups (n = 18 each) as follows: matching-platform abutments secured with noncoated abutment screws (MNC); matching-platform abutments tightened with coated abutment screws (MC); and switched-platform abutments secured with coated abutment screws (SC). Screws were characterized by scanning electron microscopy and x-ray photoelectron spectroscopy (XPS). The specimens were subjected to step-stress accelerated life testing. Use-level probability Weibull curves and reliability for 100,000 cycles at 200 N and 300 N (90% two-sided confidence intervals) were calculated. Polarized light and scanning electron microscopes were used for fractographic analysis. Results: Scanning electron microscopy revealed differences in surface texture; noncoated screws presented the typical machining grooves texture, whereas coated screws presented a plastically deformed surface layer. XPS revealed the same base components for both screws, with the exception of higher degrees of silicon in the SiO2 form for the coated samples. For 100,000 cycles at 300 N, reliability values were 0.06 (0.01 to 0.16), 0.25 (0.09 to 0.45), and 0.25 (0.08 to 0.45), for MNC, MC, and SC, respectively. The most common failure mechanism for MNC was fracture of the abutment screw, followed by bending, or its fracture, along with fracture of the abutment or implant. Coated abutment screws most commonly fractured along with the abutment, irrespective of abutment type. Conclusion: Reliability was higher for both groups with the coated screw than with the uncoated screw. Failure modes differed between coated and uncoated groups.en
dc.publisherQuintessence Publishing Co Inc
dc.relation.ispartofInternational Journal of Oral & Maxillofacial Implants
dc.sourceWeb of Science
dc.subjectabutment screwen
dc.subjectdental implantsen
dc.subjectWeibull curvesen
dc.titleEffect of Abutment Screw Surface Treatment on Reliability of Implant-Supported Crownsen
dcterms.rightsHolderQuintessence Publishing Co Inc
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionUniv Potiguar
dc.description.affiliationUniv Estadual Paulista, Aracatuba Dent Sch, Dept Dent Mat & Prosthodont, Aracatuba, SP, Brazil
dc.description.affiliationNYU, Dept Biomat & Biomimet, Coll Dent, New York, NY 10010 USA
dc.description.affiliationUniv Sao Paulo, Bauru Coll Dent, Dept Prosthodont, Bauru, SP, Brazil
dc.description.affiliationUniv Potiguar, Dept Hlth Sci, Postgrad Program Dent, Natal, RN, Brazil
dc.description.affiliationNYU, Coll Dent, Dept Periodontol & Implant Dent, New York, NY 10010 USA
dc.description.affiliationUnespUniv Estadual Paulista, Aracatuba Dent Sch, Dept Dent Mat & Prosthodont, Aracatuba, SP, Brazil
dc.rights.accessRightsAcesso restrito
unesp.campusUniversidade Estadual Paulista (Unesp), Faculdade de Odontologia, Araçatubapt[3]
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